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In some molecules and under some conditions, isomerisation occurs spontaneously. When the isomerisation occurs intramolecularly it is considered a rearrangement reaction. — “Isomerisation - Wikipedia, the free encyclopedia”, en.wikipedia.org
The alkyne zipper reaction is an organic reaction which isomerizes an organic compound containing an internal alkyne into a terminal alkyne. The reaction requires a strong base. The base used by Brown and Yamashita was potassium 1,3-diaminopropanide, generated in situ by adding potassium. — “Alkyne zipper reaction - Wikipedia, the free encyclopedia”, en.wikipedia.org
When a photon strikes the chromophore, it changes shape (isomerizes). It is this change in conformation that the protein detects and eventually leads to vision. Before the chromophore can be reused, it must be converted back to its original conformation. — “Photoisomerase - Wikipedia, the free encyclopedia”, en.wikipedia.org